<div class="pacman">

</div>

<style>

    .pacman {
        width: 0px;
        height: 0px;
        border-right: 60px solid transparent;
        border-top: 60px solid red;
        border-left: 60px solid red;
        border-bottom: 60px solid red;
        border-top-left-radius: 60px;
        border-top-right-radius: 60px;
        border-bottom-left-radius: 60px;
        border-bottom-right-radius: 60px;
    }
</style>